So I got a yank 3600 converter and 373 gears intalled..car was running good so one night I got on the converter to 2500 rpm and went up like 60 foot as I was comming to a stop I felt a clunk and tempetures got pretty high check engine light came on..so I was at a dead stop and as I pressed the gas to go rpms went pretty high and car barely moved so finally car moved and as it goes I felt clunks and rpms just free reving..took car back in and got a new transmission built level 4 or 5 can't remember..got the car back running great put 300 miles on new tranny did a couple test passes and ran great tempatures on tranny stayed cool.. As I did the test passes and just now I was getting the car ready to go to the track and I was making sure everything is fine I got on the converter to 2500 rpm went up a couple feet and it started doing the same thing..tranny temps got high and I press gas to go rpms go up to 4k and car barely moves then finnally gets going and I fel same clunks and rpms free reving..what can it be ..we thought it was the trans so got abuilt one..can it be the converter? Thanks alot

 

Either that or you are looking at a third transmission.

 

I would start with the converter. But seeing as how you got 300 miles on the new tranny with no problems it sounds like that is your problem. Hopefully that built one came with a warranty.

 

Yea tranny has 1 year warranty..I really think its the converter

 

One thing I am curious about, you say you are getting up on the converter and then going a few feet. Are you saying you are on the brake and revving the motor up to 2500rpm and then slightly letting out on the brake to move forward? If so why?

 

take it back to who ever put the verter in. is it tuned for the verter ? do you have a trans cooler added on ?

 

No I'm actually getting on the converter and going up and not just letting of..and yes has a trans cooler

 

If the line pressure for the converter isnt correct it wont engage properly either. Do you know what your tuner set your line pressure to?

 

Ttt...

 

What about your line pressure? Do you know what it is? Its possible under higher rpm the amount of fluid going to your converter isnt high enough.

 

Not sure what it is ill have to find out and let u know

 

anyone else wanna add to this

 

Help.....

 

The first thing I would do is check with the shop that did the installation and ask them to explain the procedure they followed to make sure the transmission fluid level was correct. There is a very specific set of steps that need to be followed and as much as I hate to even suggest this, if they did it wrong the first time it's very possible they repeated their mistake a second time. Even though it's a bit of a pain to do, it probably wouldn't hurt to check it yourself just to be sure and I can PM you the details if you'd like.

I agree with C6 Batmobile that it's probably not your converter because it wouldn't go bad with the first transmission, magically fix itself for 300 miles and then go bad a second time.

On the off chance that it is the converter however, after you had it installed with the first transmission how many miles did you put on it before trying to load it up? Yank recommends that you don't do that or any WOT starts for the first 200 miles so that might also be a contributing factor.

Whether or not it was tuned specifically for the converter won't make a difference because with the exception of one airflow table, you don't need to make any changes to your tune when you install a converter.

My vote is that the fluid level probably isn't correct because I blew a line in my transmission cooler a few months back and without enough fluid in the transmission it acted very similar to yours - if you step on the gas the engine just freewheels and doesn't go anywhere.

Good luck,
Christopher

 

The subfloor makes a good point about the tranny fluid. Ive heard of it being improperly serviced and the clutch packs burning out along with the symptoms your experiencing.

 

If it has fluid, I'm betting the tranny pump is broken. The motor will spin the converter but the car doesn't move.
Hopefully the person that did the tranny rebuild did the swap so any installation issues are off the table. The only true way to know what broke first is to cut open the converter and examine the tranny together. Otherwise it becomes a game of finger pointing as to what broke first and which one polluted the other.

Did you put in a new converter with the most recent rebuild, or at least cut it open and clean it out?

 

the 3rd time i took the car in i was told the tranny pump was bad and that the tranny was going to let go soon i said ok do the pump and tranny..so i just dropped it off last night with a new tranny and pump ..but i do not know if they cleaned the converter out

 

they cant clean the converter yank has to cut it open, when my trans went from a tsb then the tech screwed it up, i had them put the new trans in and sent the converter back to vig, i didnt even put it in because the trans was running hot, they found out the lines were clogged so they replaced all four, that means when the trans went they never cleaned the lines or did a flow test then the car ran that way for 1000 miles when they put the new lines on they never droped the pan to change the filter, gm is some crappy service

 

Yep, that's true - I just talked to Dave at Yank and he said the converter needs to be sent back to see if it has any metal in it from the previous failure(s) as well as rule it out as being the possible cause of the problem in the first place.

 

so should i send the converter back to yank?